Third sound on patterned substrates. I. Periodic and quasiperiodic arrays

Journal Article · Sun Oct 01 00:00:00 EDT 1989 · Physical Review (Section) B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.40.6634· OSTI ID:5400673

Smith, D T; Lorenson, C P; Hallock, R B ^[1]

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1. Laboratory for Low Temperature Physics, Department of Physics 3 Astronomy, University of Massachusetts, Amherst, Massachusetts 01003 (US)

An experimental arrangement is described which allows the study of the propagation of classical waves on substrates which can be patterned so as to present the waves with scattering sites. Helium films adsorbed on silicon substrates allow the propagation of third-sound waves whose velocity depends on both the film thickness and the local surface structure of the substrate. Detailed studies are presented for substrates which have been patterned in one dimension with periodic arrays. Band structure and perturbing effects due to imperfections in the structure and position of the scattering sites are seen on the periodic substrate. Quasiperiodic arrays are seen to have a more complicated propagation structure.

• OSTI ID: 5400673
• Journal Information: Physical Review (Section) B: Condensed Matter; (USA), Vol. 40:10; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
HELIUM II
THIRD SOUND
ADSORPTION
DISTURBANCES
THIN FILMS
WAVE PROPAGATION
EVEN-EVEN NUCLEI
FILMS
FLUIDS
HELIUM 4
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
NUCLEI
QUANTUM FLUIDS
SORPTION
STABLE ISOTOPES
640450* - Fluid Physics- Superfluidity